Kinetic isotope effect of proton-coupled electron transfer in a hydrogen bonded phenol—pyrrolidino[60]fullerene

Proton-coupled electron transfer (PCET) plays a central role in photosynthesis and potentially in solar-to-fuel systems. We report a spectroscopy study on a phenol—pyrrolidino[60]fullerene. Quenching of the singlet excited state from 1 ns to 250 ps is assigned to PCET. A H/D exchange study reveals a...

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Bibliographic Details
Published in:Photochemical & photobiological sciences 2015-12, Vol.14 (12), p.2147-2150
Main Authors: Ravensbergen, Janneke, Brown, Chelsea L., Moore, Gary F., Frese, Raoul N., van Grondelle, Rienk, Gust, Devens, Moore, Thomas A., Moore, Ana L., Kennis, John T. M.
Format: Article
Language:English
Subjects:
Biochemistry
Biomaterials
Chemistry
Communication
Electron Transport
Electrons
Fullerenes - chemistry
Hydrogen Bonding
Isotopes - chemistry
Kinetics
Phenol - chemistry
Physical Chemistry
Plant Sciences
Protons
Pyrrolidines - chemistry
Spectrophotometry
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Summary:Proton-coupled electron transfer (PCET) plays a central role in photosynthesis and potentially in solar-to-fuel systems. We report a spectroscopy study on a phenol—pyrrolidino[60]fullerene. Quenching of the singlet excited state from 1 ns to 250 ps is assigned to PCET. A H/D exchange study reveals a kinetic isotope effect (KIE) of 3.0, consistent with a concerted PCET mechanism.
ISSN:1474-905X
1474-9092
DOI:10.1039/c5pp00259a